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Pentactina rupicola Nakai

Modern name

Pentactina rupicola Nakai

A deciduous shrub 2 to 212 ft high; young shoots angled, glabrous, reddish; winter-buds silky. Leaves without stipules, alternate, very shortly stalked, mostly oblanceolate to obovate, wedge-shaped at the base, with usually three or five lobes or large teeth towards the apex, the lobes fine-pointed, often toothed, 34 to 112 in. long, 13 to 34 in. wide, glabrous above, more or less furnished with silky hairs beneath. Flowers small, white, produced in June and July on slender terminal pendulous panicles 112 to 3 in. long. Petals five, linear, 15 in. long; sepals five, triangular, persisting to the fruiting stage when they become much reflexed; stamens twenty, white, exposed. Each flower has five dry seed-vessels about 116 in. long.

Native of the Diamond Mountains of Korea and the only species known; introduced to the Arnold Arboretum in 1918 by Wilson, who found it common on cliffs. It is a graceful dwarf shrub with clustered stems, usually found wild growing in the crevices of rocks, but with more beauty in leaf and habit than in flower. It is quite hardy.



Other species in the genus

[No species article available]